Pressing member, tool body and cutting tool

Abstract

A pressing member is configured to be inserted into a pocket of a tool body for pressing and fixing a cutting insert placed in a mounting part of the pocket onto a mounting surface of the mounting part. The pressing member includes a wedge part having a contacting surface that comes into contact with an inner surface of the pocket, and a pressing surface that is in contact with the cutting insert. The pressing surface is formed so as to gradually come close to the contacting surface in an insertion direction into the pocket. The pressing member also includes a pressure-receiving part that is pushed into the pocket in the insertion direction by a fastening component that is screwed into the pocket.

What is claimed is: 
     
         1 . A pressing member that is inserted into a pocket of a tool body for pressing and fixing a cutting element placed in a mounting part of the pocket onto a mounting surface of the mounting part, the pressing member comprising:
 a wedge part having a contacting surface that comes into contact with an inner surface of the pocket, and a pressing surface that is in contact with the cutting element, wherein the pressing surface is formed so as to gradually come close to the contacting surface in an insertion direction into the pocket; and   a pressure-receiving part that is pushed into the pocket in the insertion direction by a fastening component that is screwed into the pocket.   
     
     
         2 . The pressing member according to  claim 1 , wherein, in a state where the cutting element is fixed, a contact position of the pressure-receiving part with the fastening component is located at a position that is opposed to the cutting element relative to a position of an end surface of the cutting element in an insertion direction into the mounting part. 
     
     
         3 . The pressing member according to  claim 1 , wherein, in a state where the cutting element is fixed, at least a portion of the pressure-receiving part is enclosed, over an entire circumference, by an inner circumference of a retention hole which is formed as a further recess that continues to the pocket. 
     
     
         4 . The pressing member according to  claim 1 , wherein a thickest portion of the wedge part has a thickness smaller than a diameter of the fastening component. 
     
     
         5 . The pressing member according to  claim 1 , wherein the wedge part has a receiving recess for receiving at least a portion of the fastening component, and
 wherein a wall surface of the receiving recess at a rear side in the insertion direction is configured as a withdrawal surface that is pressed by the fastening component when the fastening component is loosened from the pocket.   
     
     
         6 . The pressing member according to  claim 5 , wherein a wall surface of the receiving recess at a front side in the insertion direction is configured as a pushing surface that is pressed, along with the pressure-receiving part, by the fastening component. 
     
     
         7 . The pressing member according to  claim 1 , wherein the wedge part has outwardly protruding projections formed on both sides of the wedge part. 
     
     
         8 . The pressing member according to  claim 7 , wherein the projections do not interfere with the pocket in a state where the cutting element is fixed, and
 wherein the projections may come into contact with the pocket during removal of the cutting element.   
     
     
         9 . A tool body comprising:
 a pressing member according to  claim 1 ;   a base having a plurality of pockets into which the pressing member is inserted, the plurality of pockets being formed so as to be spaced apart in a circumferential direction; and   a fastening component that is screwed into each of the pockets,   wherein each of the pockets has a mounting part in which a cutting element is placed, and   wherein the cutting element placed in the mounting part is pressed and fixed to a mounting surface of the mounting part when the pressing member inserted into the pocket is pressed in an insertion direction into the pocket by the fastening component screwed into the pocket.   
     
     
         10 . A cutting tool comprising:
 a tool body according to claim  9 ; and   a cutting element placed in the mounting part of the pocket formed in the base of the tool body.